ICD-10 Code I45 – Other conduction disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I45 – Other conduction disorders
What it is
I45 covers conduction problems in the heart that are not classified elsewhere. These disorders affect how electrical impulses move through the cardiac conduction system and can disrupt normal rhythm.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include abnormal ECG conduction patterns, such as blocks or delays in impulse transmission, with or without symptoms like palpitations, dizziness, or syncope.
When to use this code
Use I45 when the provider documents a conduction disorder and no more specific ICD-10-CM code applies. This includes cases described as “other conduction disorder” or similar nonspecific conduction abnormalities. If the record names a specific conduction defect, code that diagnosis instead.
Do not use for
Do not use I45 for atrial fibrillation, other arrhythmias, or ischemic heart disease-related rhythm problems. Check documentation if the conduction issue is better described by a more specific code.
Coding tip
Code the most specific conduction diagnosis documented, and query if the chart only says “abnormal ECG” without a clear conduction disorder.